Thermal runaway detection method and system

Abstract

The invention provides a thermal runaway detection method and system. The method comprises the following steps: acquiring an energy transmission path of an electrochemical energy storage device; sampling the working state of the electrochemical energy storage device to obtain a plurality of monitoring data; and analyzing the monitoring data, obtaining a plurality of dynamic parameters related to the running state of the battery from the electrochemical energy storage device, and evaluating the thermal runaway risk of the electrochemical energy storage device according to the dynamic parameters. According to the energy transmission path of the electrochemical energy storage device, sampling the working state of the electrochemical energy storage device, and obtaining dynamic parameters related to the running state of the battery; and the thermal runaway risk of the electrochemical energy storage device is evaluated according to the matching of the dynamic parameters and the preset thermal runaway condition, so that online thermal runaway risk evaluation and timely thermal runaway protection strategy based on the evaluation result are realized, the operation is simple and convenient, the system structure is simple, and the applicability is wide.

Description

Technical Field

[0001] The present application relates to the field of electrochemical energy storage design and application technology, and in particular to a thermal runaway detection method and system. Background Art

[0002] Electrochemical energy storage has the characteristics of bidirectional interaction between charge and discharge and rapid response, and is of great value in peak load regulation, frequency regulation, voltage regulation, and black start of power systems. However, due to the high activity of the chemical substances used in electrochemical energy storage, the chemical reactions involved are accompanied by violent energy conversion, resulting in a greater risk of thermal runaway in electrochemical energy storage. Existing thermal runaway detection usually requires offline testing of electrochemical energy storage devices, which makes it difficult to achieve online thermal runaway risk assessment and timely thermal runaway protection strategies based on the assessment results.

[0003] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present application and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present application. Summary of the invention

[0004] Embodiments of the present application provide a thermal runaway detection method and system.

[0005] The first embodiment of the present application provides a thermal runaway detection method, comprising:

[0006] Obtaining energy transfer paths of electrochemical energy storage devices;

[0007] Based on the energy transmission path, sampling the working state of the electrochemical energy storage device to obtain a plurality of monitoring data;

[0008] Based on the analysis of the monitoring data, a plurality of dynamic parameters related to the battery operation state are obtained from the electrochemical energy storage device, and the thermal runaway risk of the electrochemical energy storage device is evaluated according to the dynamic parameters.

[0009] The second aspect of the present application provides a thermal runaway detection system, which is used to implement the thermal runaway detection method provided in the first aspect of the present application, including:

[0010] an identification module, the identification module being connected to the electrochemical energy storage device and being used to obtain an energy transmission path of the electrochemical energy storage device;

[0011] An acquisition module, the acquisition module is connected to the identification module and is used to sample the working state of the electrochemical energy storage device based on the energy transmission path to acquire a plurality of monitoring data;

[0012] A judgment module, the judgment module is connected to the acquisition module, and is used to obtain a plurality of dynamic parameters related to the battery operation state from the electrochemical energy storage device based on the analysis of the monitoring data, and to evaluate the thermal runaway risk of the electrochemical energy storage device according to the dynamic parameters;

[0013] A response module is connected to the judgment module and is used to generate a corresponding thermal runaway protection strategy based on the evaluation result of the thermal runaway risk. If there is a thermal runaway risk, the response module performs fire protection isolation on the electrochemical energy storage device.

[0014] The third aspect embodiment of the present application proposes an electronic device, comprising: a processor; a memory for storing instructions executable by the processor; wherein the processor is configured to execute the instructions to implement the thermal runaway detection method proposed in the first aspect embodiment of the present application.

[0015] The fourth aspect embodiment of the present application proposes a non-temporary computer-readable storage medium. When the instructions in the storage medium are executed by the processor of an electronic device, the electronic device can execute the method proposed in the first aspect embodiment of the present application.

[0016] The fifth aspect embodiment of the present application proposes a computer program product, including a computer program, which implements the method proposed in the first aspect embodiment of the present application when executed by a processor in a communication device.

[0017] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0018] According to the energy transmission path of the electrochemical energy storage device, the working state of the electrochemical energy storage device is sampled to obtain dynamic parameters related to the battery operation state; and according to the matching of the dynamic parameters with the preset thermal runaway conditions, the thermal runaway risk of the electrochemical energy storage device is evaluated, and online thermal runaway risk evaluation and timely thermal runaway protection strategy based on the evaluation results are realized. The operation is easy and the system structure is simple, and it has wide applicability.

[0019] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0021] Figure 1 A schematic flow chart of a thermal runaway detection method provided in an embodiment of the present application;

[0022] Figure 2A schematic flow chart of another thermal runaway detection method provided in an embodiment of the present application;

[0023] Figure 3 A schematic diagram of the structure of a thermal runaway detection system provided in an embodiment of the present application;

[0024] Figure 4 A schematic diagram of the structure of an electronic device provided according to an embodiment of the present application;

[0025] Figure 5 The figure is a schematic diagram of the structure of another electronic device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0026] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the embodiments of the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the embodiments of the present application as detailed in the appended claims.

[0027] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms of "a" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0028] It should be understood that, although the terms first, second, third, etc. may be used to describe various information in the embodiments of the present application, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the embodiments of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "if" as used herein may be interpreted as "at..." or "when..." or "in response to determination".

[0029] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0030] It should be noted that the thermal runaway detection method provided in any embodiment of the present application can be executed alone, or in combination with possible implementation methods in other embodiments, or in combination with any technical solution in the relevant technology.

[0031] The thermal runaway detection method and system thereof according to the embodiments of the present application will be described below with reference to the accompanying drawings.

[0032] Figure 1 A schematic diagram of a thermal runaway detection method provided in an embodiment of the present application. Figure 1 As shown, the method includes but is not limited to the following steps:

[0033] S101, obtaining an energy transmission path of an electrochemical energy storage device.

[0034] In a feasible implementation, the energy transmission path of the electrochemical energy storage device mainly depends on its internal structure and external connection system. Inside the electrochemical energy storage device, the transmission of energy is mainly achieved through electrochemical reactions (i.e., the electrochemical reactions of the batteries in the electrochemical energy storage device). Specifically, during charging, the electric energy provided by the external power supply passes through the positive and negative plates, electrolytes and diaphragms of the battery, causing the ions to escape from the positive electrode and be embedded in the negative electrode through the electrolyte, completing the conversion from electrical energy to chemical energy and storing it. During discharge, the ions escape from the negative electrode and are embedded in the positive electrode through the electrolyte, while releasing the stored chemical energy and converting it into electrical energy for output. The energy transmission path of the electrochemical energy storage device in the external system depends on the grid structure to which it is connected, the configuration of the energy storage system, and the application scenario.

[0035] As an example, the electrochemical energy storage device includes: a line-side load, a power supply, a switching switch, an electrochemical energy storage battery pack (EESBP), an energy storage converter (ESC), a circuit breaker (CB), an AC / DC conversion module, a battery temperature monitoring module, a battery temperature monitor (connected to the battery temperature monitoring module), a battery terminal voltage monitoring module, a voltage mutual inductance detector L1 (the voltage mutual inductance detector L1 is arranged between the electrochemical energy storage battery pack and the battery terminal voltage monitoring module), a main circuit current monitoring module, a current mutual inductance detector L2 (the current mutual inductance detector L2 is arranged between the energy storage converter and the main circuit current monitoring module) and a central processing module, wherein: the line-side load is connected to the switching switch to describe the electrical structure of the electrochemical energy storage device working in the discharge mode; the power supply is connected to the switching switch to describe the electrical structure of the electrochemical energy storage device working in the charging mode, wherein the power supply is usually provided by the power grid; The switching switch is used to switch the electrochemical energy storage device between charging mode and discharging mode; the energy storage inverter is used to regulate the electric power output from the power supply to the electrochemical energy storage battery pack in charging mode, and to convert the connection mode of the line-side load, i.e., the power supply, in the discharge mode; the circuit breaker is used to cut off the electrical connection between the electrochemical energy storage battery pack and the energy storage inverter when there is a risk of thermal runaway; the voltage mutual inductance detector L1 is connected in parallel with the electrochemical energy storage battery pack to measure the battery voltage; the current mutual inductance detector L2 is connected to the energy storage inverter to measure the main circuit current; the battery temperature monitor is used to measure the battery temperature; the central processing module is connected to the battery temperature monitoring module, the battery terminal voltage monitoring module, and the main circuit current monitoring module to make judgments on the collected data and give corresponding action instructions.

[0036] S102, sampling the working state of the electrochemical energy storage device based on the energy transmission path to obtain a plurality of monitoring data.

[0037] In a feasible implementation, sampling the working state of the electrochemical energy storage device involves comprehensive monitoring of the energy flow and conversion process inside the electrochemical energy storage device. In an electrochemical energy storage device, the energy conversion path mainly involves the input (charging process), storage (chemical reaction inside the battery), and output (discharging process) of electrical energy. In this process, electrical energy is converted and stored through components such as energy storage inverters and electrochemical energy storage battery packs. In order to comprehensively monitor the working state of the electrochemical energy storage device, it is necessary to set monitoring points at key nodes of the energy transmission path. These monitoring points include but are not limited to: monitoring the quality of electrical energy transmitted from the power supply to the electrochemical energy storage battery pack, such as voltage, current, frequency, etc.; monitoring the input current, output current, conversion efficiency, etc. of the energy storage inverter to evaluate its working state and energy conversion efficiency; monitoring the voltage, current, temperature and other parameters of the electrochemical energy storage battery pack to evaluate the health status and energy storage capacity of the battery; monitoring the quality of electrical energy output by the electrochemical energy storage battery pack to the power supply or line-side load to ensure stable and reliable power supply.

[0038] S103, based on the analysis of the monitoring data, a plurality of dynamic parameters related to the battery operation state are obtained from the electrochemical energy storage device, and the thermal runaway risk of the electrochemical energy storage device is evaluated according to the dynamic parameters.

[0039] In a feasible implementation, based on the analysis of the monitoring data of the electrochemical energy storage device, multiple dynamic parameters closely related to the battery operating status can be obtained, including: battery voltage, including the voltage of the single cell and the total voltage of the electrochemical energy storage battery pack. Abnormal voltage changes may only be caused by internal short circuits, overcharging or over-discharging of the battery; battery current, the current value of the charging process and the discharging process. Excessive current may cause the battery to overheat and increase the risk of thermal runaway; battery temperature, which directly reflects the thermal state inside the battery and is one of the main causes of thermal runaway at high temperatures; battery internal resistance, which reflects the resistance of the chemical reaction inside the battery and the health of the battery. An increase in internal resistance may indicate battery aging or damage; SOC (State of Charge), that is, the percentage of remaining power in the battery. Too high or too low SOC may affect the stability and safety of the battery; SOH (State of Health), that is, the health status of the battery, which is usually comprehensively evaluated through parameters such as battery capacity decay and internal resistance increase.

[0040] On the other hand, the acquired dynamic parameters are analyzed to identify potential problems and trends of the electrochemical energy storage device: whether the battery voltage exceeds the normal range, to determine whether there are problems such as overcharging, over-discharging or imbalance of single cells; analyze the trend of current changes to assess whether there are abnormal fluctuations or excessive current; monitor the battery temperature in real time and set a safety threshold, and issue an alarm immediately once the temperature exceeds the safety threshold; regularly monitor the change in internal resistance to assess the degree of battery aging and the rate of performance decay; ensure that the SOC is within a reasonable range to avoid long-term full charge or empty discharge.

[0041] According to the analysis results of dynamic parameters, the thermal runaway risk of the electrochemical energy storage device is evaluated, including: comprehensive evaluation of multiple parameters such as voltage, current, temperature, internal resistance, SOC and SOH using a risk assessment model; setting a thermal runaway warning threshold, and immediately issuing a warning signal when the temperature, current and other parameters are close to or exceed the warning threshold; historical data and machine learning algorithms can also be used to predict the possibility of battery failure and thermal runaway, and take measures to intervene in advance. Once the risk of thermal runaway is assessed to be high, the thermal runaway protection strategies that can be taken include: immediately stopping the charging and discharging process of the battery; starting the cooling system to reduce the battery temperature; isolating the faulty part of the battery from the electrochemical energy storage device to prevent the spread of thermal runaway.

[0042] In summary, according to the energy transmission path of the electrochemical energy storage device, the working state of the electrochemical energy storage device is sampled to obtain dynamic parameters related to the battery operation state; and according to the matching of the dynamic parameters with the preset thermal runaway conditions, the thermal runaway risk of the electrochemical energy storage device is evaluated, and online thermal runaway risk evaluation and timely thermal runaway protection strategy based on the evaluation results are realized. The operation is easy and the system structure is simple, and it has wide applicability.

[0043] Figure 2 This is a schematic diagram of another thermal runaway detection method provided in an embodiment of the present application. Figure 2 As shown, the method includes but is not limited to the following steps:

[0044] S201, identifying each component of the electrochemical energy storage device.

[0045] In a feasible implementation, the electrochemical energy storage device includes: a line side load, a power supply, a switch, an electrochemical energy storage battery pack, an energy storage converter, a circuit breaker, an AC / DC conversion module, a battery temperature monitoring module, a battery temperature monitor, a battery terminal voltage monitoring module, a voltage mutual inductance detector L1, a main circuit current monitoring module, a current mutual inductance detector L2, and a central processing module. By identifying each component, the charging and discharging process of the electrochemical energy storage device is determined.

[0046] For further details of step S201, please refer to the relevant contents in the above embodiment, which will not be repeated here.

[0047] S202, obtaining an energy transmission path of the electrochemical energy storage device from all components according to the electrochemical reaction process.

[0048] In a feasible implementation, based on the identification of each component of the electrochemical energy storage device, according to the electrochemical reaction process, the first component involved in charging is determined from all components, and all the first components involved in charging are used to construct an energy input sub-path; the second component involved in discharging is determined from all components, and all the second components involved in discharging are used to construct an energy output sub-path, wherein the energy input sub-path and the energy output sub-path constitute the energy transmission path of the entire electrochemical energy storage device.

[0049] For further specific implementation of step S202, please refer to the relevant contents in the above embodiment, which will not be repeated here.

[0050] S203, based on the energy transmission path, sampling the working state of the electrochemical energy storage device to obtain a plurality of monitoring data.

[0051] In a feasible implementation, the real-time working condition of the electrochemical energy storage device is obtained based on the energy transmission path (including the energy input subpath and the energy output subpath) of the electrochemical energy storage device. And according to the real-time working condition, multiple detection points are determined from the energy transmission path, wherein the charging circuit and the discharging circuit can be determined from the energy transmission path according to the real-time working condition; then, according to the electrochemical reaction process, the charging circuit and the discharging circuit, the key nodes of energy transmission are determined, and the detection points involved in charging and the detection points involved in discharging are set at the key nodes of the energy transmission path. Based on the detection points, the working state of the electrochemical energy storage device is sampled to obtain multiple monitoring data.

[0052] For further specific implementation of the monitoring data acquisition process, please refer to the relevant contents in the above embodiments, which will not be repeated here.

[0053] S204, based on the analysis of the monitoring data, a plurality of dynamic parameters related to the battery operation state are obtained from the electrochemical energy storage device, and the thermal runaway risk of the electrochemical energy storage device is evaluated according to the dynamic parameters.

[0054] In a feasible implementation, according to the electrochemical reaction process, the monitoring data obtained in step S203 is analyzed, and a sampling period corresponding to the monitoring data is determined. According to each component and sampling period of the electrochemical energy storage device, the main circuit current I, the battery charging voltage U1, the battery charging temperature t1, the battery discharging voltage U2 and the battery discharging temperature t2 are obtained.

[0055] In the same sampling period, the dynamic internal resistance of the battery is determined according to the main circuit current I, the battery charging voltage U1 and the battery discharging voltage U2. Specifically, a difference operation is performed on the battery charging voltage U1 and the battery discharging voltage U2 to obtain a first intermediate value, wherein the first intermediate value is equal to |U1-U2|. A division operation is performed on the first intermediate value and the main circuit current I to obtain a second intermediate value, wherein the second intermediate value is equal to The second intermediate value and the non-polarized internal resistance r of the battery are summed to obtain the dynamic internal resistance R of the battery, where:

[0056] On the other hand, the first parameter of battery temperature rise is determined according to the dynamic internal resistance R and the main circuit current of the battery. More specifically, according to the properties of the electrochemical energy storage battery pack, the battery comprehensive heat transfer coefficient a, the battery specific heat capacity C, the battery mass m, the battery rated operating temperature ts and the battery heat dissipation area F are obtained, and combined with the battery charging temperature t1, the first parameter of battery temperature rise during charging is determined, wherein the first parameter can be expressed as:

[0057]

[0058] If the battery is in the discharge process, the first parameter of the battery temperature rise during the discharge process is determined in combination with the battery discharge temperature t2. At this time, the first parameter can be expressed as:

[0059]

[0060] According to the comparison operation between the first parameter and the preset thermal runaway condition, the thermal runaway risk of the electrochemical energy storage device is evaluated. Specifically, in the current sampling period, it is determined whether the first parameter exceeds the preset temperature risk value Δt max , if the first parameter ≤ temperature risk value Δt max , then in the next sampling period, the comparison operation between the first parameter and the preset thermal runaway condition is continued to evaluate the thermal runaway risk of the electrochemical energy storage device; in the current sampling period, if the first parameter is greater than the temperature risk value Δt max , continue to determine whether the first parameter exceeds the preset temperature alarm value Δt war , where the temperature risk value Δt max <Temperature alarm value Δt war , if the first parameter ≤ temperature alarm value Δt war , then the electrochemical energy storage device does not have a risk of thermal runaway. If the first parameter is greater than the temperature alarm value Δt war , the electrochemical energy storage device is at risk of thermal runaway.

[0061] If the electrochemical energy storage device does not have the risk of thermal runaway, the central processing module sends an instruction to the energy storage converter to maintain the current power, where the current power can be represented by P given If the electrochemical energy storage device has a risk of thermal runaway, according to the first parameter, the temperature risk value Δt max And the temperature alarm value Δt war , determine the regulating power of the energy storage converter, control the energy storage converter through the regulating power, and the central processing module drives the circuit breaker to disconnect, isolate the electrochemical energy storage battery pack for fire protection, and send a system alarm to the superior, wherein the regulating power can be expressed as:

[0062]

[0063] In summary, according to the energy transmission path of the electrochemical energy storage device, the working state of the electrochemical energy storage device is sampled to obtain dynamic parameters related to the battery operation state; and according to the matching of the dynamic parameters with the preset thermal runaway conditions, the thermal runaway risk of the electrochemical energy storage device is evaluated, and online thermal runaway risk evaluation and timely thermal runaway protection strategy based on the evaluation results are realized. The operation is easy and the system structure is simple, and it has wide applicability.

[0064] Figure 3 This is a schematic diagram of the structure of a thermal runaway detection system provided in an embodiment of the present application. Figure 3 As shown, the thermal runaway detection system 300 comprises:

[0065] An identification module 301, which is connected to the electrochemical energy storage device and is used to obtain an energy transmission path of the electrochemical energy storage device;

[0066] An acquisition module 302, which is connected to the identification module 301 and is used to sample the working state of the electrochemical energy storage device based on the energy transmission path to obtain multiple monitoring data;

[0067] A judgment module 303, which is connected to the acquisition module 302, is used to obtain multiple dynamic parameters related to the battery operation state from the electrochemical energy storage device based on the analysis of the monitoring data, and evaluate the thermal runaway risk of the electrochemical energy storage device according to the dynamic parameters;

[0068] The response module 304 is connected to the judgment module 303 and is used to generate a corresponding thermal runaway protection strategy based on the evaluation result of the thermal runaway risk. If there is a thermal runaway risk, the response module 304 performs fire protection isolation on the electrochemical energy storage device.

[0069] Figure 4 The present invention is a block diagram of an electronic device according to an exemplary embodiment. Figure 4 The electronic device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0070] like Figure 4 As shown, the electronic device 400 includes a processor 401, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 402 or a program loaded from a memory 406 to a random access memory (RAM) 403. In the RAM 403, various programs and data required for the operation of the electronic device 400 are also stored. The processor 401, the ROM 402, and the RAM 403 are connected to each other via a bus 404. An input / output (I / O) interface 405 is also connected to the bus 404.

[0071] The following components are connected to the I / O interface 405: a memory 406 including a hard disk, etc.; and a communication part 407 including a network interface card such as a LAN (Local Area Network) card, a modem, etc., and the communication part 407 performs communication processing via a network such as the Internet; a drive 408 is also connected to the I / O interface 405 as needed.

[0072] In particular, according to an embodiment of the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part 407. When the computer program is executed by the processor 401, the above-mentioned functions defined in the method of the present application are executed.

[0073] In an exemplary embodiment, a storage medium including instructions is also provided, such as a memory including instructions, and the instructions can be executed by the processor 401 of the electronic device 400 to complete the above method. Optionally, the storage medium can be a non-transitory computer-readable storage medium, for example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0074] In the present application, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in combination with an instruction execution system, apparatus, or device. In the present application, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in combination with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium may be transmitted using any suitable medium, including but not limited to: wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

[0075] Figure 5 It is a structural block diagram of another electronic device according to an exemplary embodiment. Figure 5 The electronic device shown is only an example and should not limit the functions and scope of use of the embodiments of the present application. Figure 5 As shown, the electronic device 500 includes a processor 501 and a memory 502. The memory 502 is used to store program codes, and the processor 501 is connected to the memory 502 to read the program codes from the memory 502 to implement the thermal runaway detection method in the above embodiment.

[0076] Optionally, the number of processors 501 may be one or more.

[0077] Optionally, the electronic device may further include an interface 503, and the number of the interface 503 may be multiple. The interface 503 may be connected to an application program and may receive data from an external device such as a sensor.

[0078] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed in this application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0079] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A thermal runaway detection method, characterized in that: include: Obtaining energy transfer paths of electrochemical energy storage devices; Based on the energy transmission path, sampling the working state of the electrochemical energy storage device to obtain a plurality of monitoring data; Based on the analysis of the monitoring data, a plurality of dynamic parameters related to the battery operation state are obtained from the electrochemical energy storage device, and the thermal runaway risk of the electrochemical energy storage device is evaluated according to the dynamic parameters.

2. The method according to claim 1, characterized in that The energy transmission path of the electrochemical energy storage device is obtained, including: Identify each component of the electrochemical energy storage device; According to the electrochemical reaction process, determining a first component participating in charging from among all the components; According to the first component, obtaining an energy input subpath; According to the electrochemical reaction process, determining a second component participating in discharge from all the components; According to the second component, an energy output subpath is obtained.

3. The method according to claim 1, characterized in that Based on the energy transmission path, sampling the working state of the electrochemical energy storage device to obtain multiple monitoring data includes: According to the energy transmission path, identifying the real-time operating condition of the electrochemical energy storage device; According to the real-time working condition, determining a plurality of detection points from the energy transmission path; Based on the detection points, the working state of the electrochemical energy storage device is sampled to obtain a plurality of monitoring data.

4. The method according to claim 3, characterized in that Determining a plurality of detection points from the energy transmission path according to the real-time working condition includes: According to the real-time working condition, determining a charging circuit and a discharging circuit from the energy transmission path; Determining detection points involved in charging according to the electrochemical reaction process and the charging circuit; According to the electrochemical reaction process and the discharge circuit, the detection points involved in the discharge are determined.

5. The method according to claim 1, characterized in that Based on the analysis of the monitoring data, a plurality of dynamic parameters related to the battery operation state are obtained from the electrochemical energy storage device, including: According to the electrochemical reaction process, the monitoring data is analyzed to determine the sampling period; According to the sampling period, the main circuit current, the battery charging voltage, the battery charging temperature, the battery discharging voltage and the battery discharging temperature are obtained from the electrochemical energy storage device.

6. The method according to claim 1 or 5, characterized in that: The step of evaluating the thermal runaway risk of the electrochemical energy storage device according to the dynamic parameters includes: In the same sampling period, the main circuit current, the battery charging voltage and the battery discharging voltage are obtained from the dynamic parameters; Performing a difference operation on the battery charging voltage and the battery discharging voltage to obtain a first intermediate value; Performing a division operation on the first intermediate value and the main loop current to obtain a second intermediate value; performing a sum operation on the second intermediate value and the non-polarization internal resistance of the battery to obtain the dynamic internal resistance of the battery; Determining a first parameter of battery temperature rise according to the dynamic internal resistance and the main loop current; Based on the matching of the first parameter with the preset thermal runaway condition, the thermal runaway risk of the electrochemical energy storage device is evaluated.

7. The method according to claim 6, characterized in that The step of evaluating the thermal runaway risk of the electrochemical energy storage device based on the matching of the first parameter with the preset thermal runaway condition includes: In the current sampling period, if the first parameter does not exceed the preset temperature risk value, the matching is performed in the next sampling period; In the current sampling period, if the first parameter exceeds the temperature risk value and the first parameter does not exceed the temperature alarm value, there is no thermal runaway risk in the electrochemical energy storage device, wherein the temperature risk value is less than the temperature alarm value; In the current sampling period, if the first parameter exceeds the temperature risk value and the first parameter exceeds the temperature alarm value, there is a risk of thermal runaway in the electrochemical energy storage device.

8. A thermal runaway detection system, used to implement the thermal runaway detection method according to any one of claims 1 to 7, characterized in that: include: an identification module, the identification module being connected to the electrochemical energy storage device and being used to obtain an energy transmission path of the electrochemical energy storage device; An acquisition module, the acquisition module is connected to the identification module and is used to sample the working state of the electrochemical energy storage device based on the energy transmission path to acquire a plurality of monitoring data; A judgment module, the judgment module is connected to the acquisition module, and is used to obtain a plurality of dynamic parameters related to the battery operation state from the electrochemical energy storage device based on the analysis of the monitoring data, and to evaluate the thermal runaway risk of the electrochemical energy storage device according to the dynamic parameters; A response module is connected to the judgment module and is used to generate a corresponding thermal runaway protection strategy based on the evaluation result of the thermal runaway risk. If there is a thermal runaway risk, the response module performs fire protection isolation on the electrochemical energy storage device.

9. A non-transitory computer-readable storage medium, characterized in that: When the instructions in the storage medium are executed by a processor of an electronic device, the electronic device is enabled to execute the method as claimed in any one of claims 1 to 7.

10. A computer program product, characterized in that The invention comprises a computer program, which implements the method according to any one of claims 1 to 7 when being executed by a processor.

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